How do i enable media option on android emulator with command line-Collection of common programming errors

in my app i am recording speech so that i need to set up my emulator able to record speech. i have searched in the google i got some solution that is need to start emulator by manually with media option. i use the following cmd but i got error.

emulator -avd Test -audio-in MIC

i am using Android 2.2(Api 2.2) on windows 7. How do i enable MIC option on my emulator. please help me.

I got the following error:

>emulator -avd Test -audio-in MIC

>unknown option: -audio-in

please use -help for a list of valid options